package com.example.p81;

import java.util.HashSet;
import java.util.Iterator;

/**
 * @author Lenovo
 */
public class Main {
    public static void main(String[] args) {
        System.out.println("集合实例!\n");
        int size;
        HashSet collection = new HashSet();
        String str1 ="Yellow", str2 ="White", str3 ="Green", str4 ="Blue";
        Iterator iterator;
        collection.add(str1);
        collection.add(str2);
        collection.add(str3);
        collection.add(str4);
        System.out.print("集合数据：");
        iterator = collection.iterator();
        while (iterator.hasNext()) {
            System.out.print(iterator.next() + " ");
        }
        System.out.println();
        size = collection.size();
        if (collection.isEmpty()) {
            System.out.println("集合为空！");
        } else {
            System.out.println("集合大小为：" + size);
        }
        System.out.println();
        }
    }

